Ii bipolar junction transistor introduction



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UNIT-2 5

Questions for practice: 
What is bipolar junction transistor? how are its terminals named? 
Explain the operation of npn and pnp transistors. 
What are the different configurations of BJT? 
Explain the input and output characteristics of a transistor in CB configuration. 
Derive the relationship between α and β. 
How will you determine h-parameters from the characteristics of CE configuration. 
What is the 
relation I
B,
I

and I
c
in CB configuration? 
What is meant by Q-point? 
Draw the Ebers-moll model for a PNP transistor and give the equations for emitter 
current and collector current. 
What is need for biasing a transistor? 
What is thermal runaway? how it can be avoided? 


What three factors contribute to thermal instability? 
Define stability factor. why would it seem more reasonable to call this an instability 
factor? 
Draw a fixed bias circuit and derive an expression for the stability factor. 
Derive an expression for stability factor of a collector-to-base bias circuit. 
Mention the disadvantages of collector-to-base bias. can they be overcome? 
Draw a circuit diagram of CE transistor amplifier using emitter biasing. describe 
qualitatively the stability action of circuit. 
Why does potential divider method of bias become universal? 
Determine the stability factor for CB amplifier circuit. 
How will you provide temperature compensation for the variations of V
BE
and 
stabilization of the operating point?

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